Need help with setting up a machine
Hi, I'm new to sewing. Recently bought some old sewing machine, without manual and sticker with model. It is probably AEG MN791. I found some manual on the internet, but not in my language, so have problems with setting it up. It worked only on few stitches.
I see two dials on the front, left is with casual stitches genre's number (upper row of stitches on the right). And those green number in contours: 1, 2-4, 3. Right dial is for length of stitches, with number 0-4, and range between 0-1 for soft fabrics. It has also red, contoured range +1-10-, for overlock's stich width. If I'd choose more into minus, it'd be narrower. If more into plus, it'd be wider.
Have 2 recent problems:
Upper thread is breaking after few stitches.
Lower thread doesn't make know with upper thread when I move big wheel toward me. It happens very seldom, randomly. I checked bobbin, inserted new needle (flat space towards back side) and thread, set thread tension on 3 and 4. Maybe there is a way to correct those mechanism's movement, to make it work correct?
I don't know how to set first row's casual stitches width.
I don't know how to choose overlock's stitches from the second row.
I don't know what is the purpose of green numbers: 1, 2-4, 3 on the left dial and above rows with stitches.
I don't know how to choose overlock's stitches length.
I attached some pictures. If anyone could help, I'd be grateful.